are there other similar states that have the same types of laws like florida? he would want me to make a comparison. -- you would want me to make a comparison. europe has about the same rate of multiple victim shootings as the united states. it is not just the norway attack that you had in 2011 but before a new town, the country with the , the countrynewton with tehe two worst public school shootings in the world was germany. europe had had the three worst public schools shootings. germinate, it takes one year to get a bolt-action rifle. you have to go under two psychological screening tests. bill landes at the university of chicago -- the reason so much empirical work is being done here, it is easy to compare the 50 states. we have similar types of laws, we have data that is compatible across the state, you have different states that changed their laws at different times a you can have a lot of different tests. bill and i have looked at things like assault weapons bans because different states have different ones, background checks, waiting periods, there were